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public static class ExtensionMethod
    {
        public static string UppercaseFirstLetter(this string value)
        {
            // Uppercase the first letter in the string.
            if (value.Length > 0)
            {
                char[] array = value.ToCharArray();
                array[0] = char.ToUpper(array[0]);
                return new string(array);
            }
            return value;
        }
    }

//"THIS" in the signature of a method means method can be called in the class preceding the keyword this

class Program
    {
        static void Main(string[] args)
        {
            string value = "dot net perls";
            value = value.UppercaseFirstLetter();
            Console.WriteLine(value);
            Console.ReadLine();
        }
    }